[問題]考古題from23-Q18

[pamelatsai]

Though the remains of some of the oldest hominid specimens have almost turned to stone as molecules of minerals have saturated the bone, most are not mineralized, only partially are so.

答案是(E) or are only partially so
請問 (D) or only in part哪裡有錯
還有句首的Though 是當連接詞用嗎?
謝謝!!